Clock



FIG. 1 is a front elevational view of a clock showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image with the weight shown broken-away for ease of illustration;

FIG. 3 is a right-front perspective view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top plan view thereof. 

The ornamental design for a clock, as shown and described. 